<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div class="home-header">
        <img src="~assets/img/logo.png" alt="logo picture" class="header-img">
        <span>电商管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">
          <i class="el-icon-s-operation"></i>
        </div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744"
                 text-color="#fff"
                 active-text-color="#ffd04b"
                 :collapse="isCollapse"
                 :collapse-transition="false"
                 :default-active="activePath"
                 unique-opened
                 router>
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''"
                      v-for="item in menuList"
                      :key="item.id">
            <!-- 一级菜单的模板 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path"
                          v-for="subItem in item.children"
                          :key="subItem.id"
                          @click="saveActivePath('/'+ subItem.path)">
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-container>
        <!-- 右侧主体内容 -->
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </el-container>
</template>

<script>
export default {
  // eslint-disable-next-line vue/multi-word-component-names
  name: "Home",
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      // icon 图标
      iconsObj: {
        // 一级菜单的icon图标
        147: 'el-icon-magic-stick',
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      activePath: ''
    }
  },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear();
      this.$router.push('/login');
      this.$message({
        showClose: true,
        message: '退出成功',
        type: 'success'
      })
    },
    // 获取菜单的数据
    async getMenuList() {
      const {data: res} = await this.$http.get('menus');
      if (res.meta.status != 200) return this.$message.error(res.meta.msg);
      this.menuList = res.data;
      // console.log(res);
    },
    // 点击按钮的，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveActivePath(activePath) {
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
  // 从父类继承的样式
  > .home-header {
    display: flex;
    align-items: center;
    margin-left: 15px;

    span {
      margin-left: 15px;
    }
  }

  .header-img {
    height: 50px;
    width: 50px;
  }
}

.el-aside {
  background-color: #333744;

  .el-menu {
    border-right: none;
  }

  // 强制去除内padding
  /deep/ .el-submenu__title {
    padding-left: 20px !important;
    padding-right: 40px;
  }

  .el-submenu [class^=icon] {
    vertical-align: middle;
    margin-right: 5px;
    width: 24px;
    text-align: center;
    font-size: 18px;
  }
}

.toggle-button {
  background-color: #4A5064;
  font-size: 20px;
  line-height: 24px;
  color: #ffffff;
  text-align: center;
  // 设置字母之间的间距，这里为图标不是字母，所以不生效
  letter-spacing: 0.2em;
  // 光标的样式
  cursor: pointer;
}

.el-main {
  background-color: #EAEDF1;
}


</style>
